CN110557031A - Frequency converter and frequency converter system - Google Patents
Frequency converter and frequency converter system Download PDFInfo
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- CN110557031A CN110557031A CN201910874308.1A CN201910874308A CN110557031A CN 110557031 A CN110557031 A CN 110557031A CN 201910874308 A CN201910874308 A CN 201910874308A CN 110557031 A CN110557031 A CN 110557031A
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- 238000002955 isolation Methods 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000005669 field effect Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910001219 R-phase Inorganic materials 0.000 description 2
- 230000018199 S phase Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
the application discloses a frequency converter and a frequency converter system, wherein the frequency converter comprises a frequency conversion circuit and an auxiliary power supply, the frequency conversion circuit is used for receiving a power supply signal and processing the power supply signal to obtain a bus voltage; the auxiliary power supply is coupled with the frequency conversion circuit and comprises a first voltage reduction circuit and an isolation circuit, wherein the first voltage reduction circuit and the isolation circuit are coupled with each other, the first voltage reduction circuit is used for adjusting the bus voltage to be a first preset voltage, and the isolation circuit is used for adjusting the first preset voltage to be a second preset voltage and isolating the first preset voltage from the second preset voltage. By means of the mode, the circuit efficiency can be improved, the whole size of the circuit is reduced, and the cost is reduced.
Description
Technical Field
The application relates to the technical field of integrated circuits, in particular to a frequency converter and a frequency converter system.
Background
In the prior art, in order to supply power to an internal power supply of a frequency converter, an isolated topology structure (such as a flyback topology) is usually adopted to supply power to an internal circuit of a system, however, the isolated topology structure has a large volume and high cost, especially in the application of a low-power frequency converter, the requirements on the volume and the cost of the system are very high, and the volume and the cost are difficult to further reduce.
The traditional converter internal auxiliary power supply generally adopts a flyback switching power supply topological design, the converter internal auxiliary power supply supplies power for a converter internal circuit, and since a primary side power supply and a secondary side power supply are generally arranged in a circuit, an isolation type topological structure is adopted to generate multi-path output voltage, so that the primary side circuit and the secondary side circuit can be supplied with power. The primary side circuit power supply and the secondary side circuit power supply need to have a certain distance to meet the safety requirements, and in order for the transformer to meet the safety requirements, a large retaining wall needs to be added to meet the distance, so that the size of the transformer is large, and the cost is increased. In addition, the voltage stress of the primary switch tube in the circuit is very high, for a 220V system, the switch tube with the voltage stress of more than 800V is generally required to be selected, and the higher the voltage stress of the switch tube is, the poorer the switching characteristic is, the higher the switching loss is, the switching frequency is usually less than 100KHz, the larger the volume of the magnetic element is, and the overall cost is higher.
Disclosure of Invention
The problem that this application mainly solved provides a converter and converter system, can improve circuit efficiency, reduces the whole volume of circuit, reduce cost.
In order to solve the technical problem, the technical scheme adopted by the application is as follows: the frequency converter comprises a frequency conversion circuit and an auxiliary power supply, wherein the frequency conversion circuit is used for receiving a power supply signal and processing the power supply signal to obtain a bus voltage; the auxiliary power supply is coupled with the frequency conversion circuit and comprises a first voltage reduction circuit and an isolation circuit, wherein the first voltage reduction circuit and the isolation circuit are coupled with each other, the first voltage reduction circuit is used for adjusting the bus voltage to be a first preset voltage, and the isolation circuit is used for adjusting the first preset voltage to be a second preset voltage and isolating the first preset voltage from the second preset voltage.
In order to solve the above technical problem, another technical solution adopted by the present application is: the frequency converter system comprises a frequency converter and a motor which are coupled with each other, wherein the frequency converter is used for receiving a power supply signal and generating three-phase alternating current according to the power supply signal, and the motor is used for operating under the driving of the three-phase alternating current, and the frequency converter is the frequency converter.
Through the scheme, the beneficial effects of the application are that: this converter includes inverter circuit and the auxiliary power supply who is coupled with inverter circuit, auxiliary power supply includes first step-down circuit and the isolating circuit who is coupled with first step-down circuit, first step-down circuit can reduce the busbar voltage of inverter circuit output, output first preset voltage and give the circuit of once side, circuit efficiency is improved, first step-down circuit outputs first preset voltage simultaneously and gives isolating circuit, compare prior art, the received input voltage of isolating circuit reduces, make the volume of the magnetic element among the isolating circuit reduce, because the shared space of magnetic element is great in isolating circuit, thereby help reducing the whole volume of circuit, but reduction in production cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
fig. 1 is a schematic structural diagram of an embodiment of a frequency converter provided in the present application;
FIG. 2 is a schematic structural diagram of another embodiment of a frequency converter provided in the present application;
Fig. 3 is a schematic structural diagram of an embodiment of a frequency converter system provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a frequency converter provided in the present application, where the frequency converter 10 includes: a frequency conversion circuit 11 and an auxiliary power supply 12.
the frequency conversion circuit 11 is used for receiving a power supply signal and processing the power supply signal to obtain a bus voltage; the power signal may be an ac signal, the bus voltage may be a dc voltage, and the frequency conversion circuit 11 may convert the ac signal into the dc bus voltage.
An input terminal of the auxiliary power supply 12 is coupled to an output terminal of the frequency converter circuit 11, the auxiliary power supply 12 includes a first voltage-dropping circuit 121 and an isolation circuit 122 coupled to each other, and the auxiliary power supply 12 can provide a voltage for the circuit in the frequency converter 10 to be used as an internal power supply.
Further, an input terminal of the first voltage-reducing circuit 121 is coupled to an output terminal of the frequency conversion circuit 11, the first voltage-reducing circuit 121 is configured to adjust the bus voltage to a first preset voltage, where the first preset voltage may be smaller than the bus voltage, and the first preset voltage may supply a circuit (not shown) on a primary side in the frequency converter 10 and provide an input voltage for the isolation circuit 122.
In practical applications, electrical isolation is often required between the input and output of the power supply for reasons such as voltage level conversion, safety, isolation, or series/parallel connection of the system, and an isolation circuit 122 may be provided. The input end of the isolation circuit 122 is coupled to the output end of the first voltage-reducing circuit 121, the isolation circuit 122 is configured to adjust the first preset voltage to a second preset voltage, and isolate the first preset voltage from the second preset voltage, the second preset voltage may supply power to a circuit (not shown in the figure) in the frequency converter 10 for secondary measurement, and the second preset voltage may be the same as or different from the first preset voltage.
The bus voltage output by the frequency conversion circuit 11 is reduced by the first voltage reduction circuit 121, and a first preset voltage is output to the circuit on the primary side, so that the circuit efficiency is improved, meanwhile, the first voltage reduction circuit 121 outputs the first preset voltage to the isolation circuit 122, compared with the prior art, the input voltage received by the isolation circuit 122 is reduced, the size adaptability of a magnetic element (not shown in the figure) in the isolation circuit 122 is reduced, and the occupied space of the magnetic element in the isolation circuit 122 is larger, so that the whole size of the circuit is favorably reduced, and the production cost can be reduced.
Referring to fig. 1 and 2, fig. 2 is a schematic structural diagram of another embodiment of the frequency converter provided in the present application, and different from the above embodiments, the frequency converter 10 in the present embodiment further includes a second voltage-reducing circuit 123, an input end of the second voltage-reducing circuit 123 is coupled to an output end of the first voltage-reducing circuit 121, the second voltage-reducing circuit 123 is configured to adjust the first preset voltage to a third preset voltage, the third preset voltage is smaller than the first preset voltage, and the number of the second voltage-reducing circuits 123 may be set according to specific requirements.
in a specific embodiment, the number of the second voltage-reducing circuits 123 is at least two, and the second voltage-reducing circuits 123 are coupled in sequence, that is, the output terminal of the second voltage-reducing circuit 123 is coupled to the input terminal of another second voltage-reducing circuit 123, and the second voltage-reducing circuits 123 of a corresponding number can be set according to the voltage required by the primary-side circuit, and the second voltage-reducing circuits 123 and the first voltage-reducing circuits 121 have the same structure and parameters. In other embodiments, the input terminals of the second voltage-reducing circuit 123 may be respectively connected to the output terminals of the first voltage-reducing circuit 121, and the circuit structures or parameters of the second voltage-reducing circuit 123 may be different, so as to reduce the first preset voltage respectively to obtain different voltage values.
The first voltage-reducing circuit 121 and the second voltage-reducing circuit 123 are both voltage-reducing converting circuits (BUCK), and the isolating circuit 122 is an isolating direct current circuit (isolating DC-DC circuit), which is an isolating DC-DC converter.
The first voltage-reducing circuit 121 obtains the bus voltage from the output terminal of the rectifying circuit 111, and reduces the bus voltage to generate a primary-side power supply voltage, and if the primary-side circuit needs other voltages, the output terminal of the first voltage-reducing circuit 121 may be coupled to the input terminal of the second voltage-reducing circuit 123 to generate other voltage values. The secondary side supply voltage can be generated by the isolation circuit 122, and if the secondary side circuit needs other supply voltages, it can be realized by adding an output winding in an internal transformer (not shown in the figure) of the isolation circuit 122; for example, if 3 supply voltage values need to be generated, two sets of output windings may be added.
The first voltage-reducing circuit 121, the isolating circuit 122 and the second voltage-reducing circuit 123 each include a magnetic element (not shown in the figure) for filtering or converting an input voltage; specifically, the magnetic element may be an inductor or a transformer, the inductor may filter a high frequency signal in the input signal, and the transformer may perform voltage conversion on the input signal.
Since the first preset voltage received by the isolation circuit 122 and the second voltage-reducing circuit 123 is a voltage obtained by reducing the bus voltage, the isolation circuit 122 and the second voltage-reducing circuit 123 can be formed by using a switching tube (not shown) or a magnetic element with a lower withstand voltage value, the volume of the magnetic element is greatly reduced, and since the magnetic element occupies a larger area in the second voltage-reducing circuit 123 or the isolation circuit 122, the circuit structure is increased, but the volume of the frequency converter 10 is reduced as a whole; and because the withstand voltage value of the switching tube is reduced, the voltage stress of the switching tube is reduced, the switching characteristic is improved, and the switching loss can be reduced.
The power supply signal received by the frequency conversion circuit 11 is RST three-phase alternating current, and the frequency conversion circuit 11 includes: a rectifying circuit 111, a current limiting circuit 112, a filter circuit 113, and an inverter circuit 114.
The rectifying circuit 111 is configured to rectify a power supply signal to generate a bus voltage; specifically, the rectifying circuit 111 is a rectifying bridge including a first diode D1 to a sixth diode D6, one end of the first diode D1 is coupled to an input terminal of the current limiting circuit 112, the other end of the first diode D1 is coupled to an R-phase power input terminal and one end of a second diode D2, and the other end of the second diode D2 is grounded; one end of the third diode D3 is coupled to the input terminal of the current limiting circuit 112, the other end of the third diode D3 is coupled to the S-phase power input terminal and one end of the fourth diode D4, and the other end of the fourth diode D4 is grounded; one end of the fifth diode D5 is coupled to the input terminal of the current limiting circuit 112, the other end of the fifth diode D5 is coupled to the T-phase power input terminal and one end of the sixth diode D6, and the other end of the sixth diode D6 is grounded.
The current limiting circuit 112 is coupled to the output end of the rectifying circuit 111, the input end of the inverter circuit 114, and the input end of the first voltage reducing circuit 121, and is configured to control a current value input to the inverter circuit 114 within a preset current range; specifically, an input terminal of the current limiting circuit 112 is coupled to an output terminal of the rectifying circuit 111, and an output terminal of the current limiting circuit 112 is coupled to an input terminal of the filter circuit 113, an input terminal of the inverter circuit 114, and an input terminal of the first voltage-reducing circuit 121.
In a specific embodiment, the current limiting circuit 112 includes a switch K and a current limiting resistor R1 connected in parallel, one end of the switch K is connected to the output end of the rectifying circuit 111, and the other end of the switch K is connected to the input end of the filter circuit 113 and the input end of the inverter circuit 114; the frequency converter 10 further includes a control circuit (not shown in the figure), the control circuit is coupled to a control terminal (not shown in the figure) of the switch K, and the control circuit is configured to control the switch K to be turned on and off; when the switch K is turned on, the current limiting resistor R1 is short-circuited, and the rectifying circuit 111 is coupled to the inverter circuit 114; when the switch K is turned off, the rectifying circuit 111 is coupled to the inverter circuit 114 through the current limiting resistor R1; specifically, the switch K may be a relay, a contactor, a field effect transistor, or the like.
The filter circuit 113 is coupled to the output terminal of the current limiting circuit 112 and the input terminal of the inverter circuit 114, and is configured to filter the signal output by the current limiting circuit 112 and input the filtered signal to the inverter circuit 114; specifically, the filter circuit 113 includes a filter capacitor C, one end of the filter capacitor C is coupled to the output terminal of the current limiting circuit 112 and the input terminal of the inverter circuit 114, and the other end of the filter capacitor C is grounded.
a current-limiting resistor R1 and a switch K are coupled between the rectifier bridge and the filter capacitor C, and the current-limiting circuit 112 is provided to ensure that when the inverter 10 receives RST three-phase alternating current, the voltage on the filter capacitor C is 0V, and when the power supply voltage is 220V, the peak value of the rectified voltage is 311V, and at this time, a large charging inrush current occurs at the moment of power supply connection, which may damage the rectifier diodes D1-D6; in addition, the filter capacitor C with the terminal voltage of 0 can instantaneously reduce the rectified voltage to 0V, which causes interference to the power supply network. A current limiting resistor R1 is connected between the rectifier bridge and the filter capacitor C, so that the charging current of the filter capacitor C can be limited within an allowable range. However, if the current limiting resistor R1 is always connected in the circuit, the voltage drop will affect the output voltage of the frequency converter 10, and also will reduce the power conversion efficiency of the frequency converter 10, so after the filter capacitor C is charged, the control circuit sends out a control signal to control the switch K to close, so as to short-circuit the current limiting resistor R1.
The inverter circuit 114 is coupled to the output end of the rectifier circuit 111 through the current limiting circuit 112, and is configured to invert the bus voltage into a three-phase alternating current, where the three-phase alternating current output by the inverter circuit 114 is a UVW three-phase alternating current; specifically, the input end of the inverter circuit 114 is coupled to one end of the current limiting resistor R1, the switch K, and the filter capacitor C, and the output end of the inverter circuit 114 is connected to the input end of the three-phase motor 20; in addition, in order to limit the current input to the three-phase motor 20, resistors R2-R4 may be provided between the output terminal of the inverter circuit 114 and the input terminal of the three-phase motor 20.
The frequency converter 10 actually outputs at least three forms of voltage: the isolation circuit comprises UVW three-phase alternating current, direct current voltage output by the isolation DC-DC circuit and direct current voltage output by the BUCK circuit.
In a specific embodiment, the inverter circuit 114 includes a first transistor T1-a seventh transistor T7 and a seventh diode D7-a thirteenth diode D13; specifically, the transistors (T1-T7) may be Metal Oxide Semiconductor field effect transistors (MOS) or Insulated Gate Bipolar Transistors (IGBT), fig. 2 illustrates an example of an IGBT, g, c, and e are a Gate, a collector, and an emitter of the IGBT, respectively, and the Gate g may be coupled to the control circuit.
three-phase alternating current input from input ends of R-phase, S-phase and T-phase power supplies is rectified into direct current through a three-phase rectifier bridge formed by rectifier diodes D-D6, a plurality of IGBT tubes (T1-T7) form a three-phase inverter bridge, and the direct current output by the current limiting circuit 112 is inverted into UVW three-phase alternating current with adjustable frequency and voltage.
The first voltage reduction circuit 121 is adopted to convert the bus voltage into low voltage and then supply power to the primary side circuit, so that the circuit efficiency is improved; the voltage stress of the switching tube in the BUCK circuit is bus voltage, namely, the switching tube with the voltage stress of 600V only needs to be selected, and compared with the switching tube with the voltage stress of 800V, the switching tube has the advantages of smaller switching loss and lower price. The circuit power supply of the secondary side adopts the isolation circuit 122 to supply power, and the voltage resistance of circuit devices in the circuit of the secondary side is very low, usually only dozens of volts, the cost is very low, and meanwhile, the switching frequency can be designed to be higher, and can reach the MHz level, so that the volume of the magnetic element is smaller, the system volume can be reduced, the cost of the magnetic element is also lower, the production cost can be reduced, the power density can be improved, and the loss can be reduced.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of a frequency converter system provided in the present application, where the frequency converter system 30 includes a frequency converter 10 and a motor 20 coupled to each other, the frequency converter 10 is configured to receive a power signal and generate a three-phase alternating current according to the power signal, and the motor 20 is configured to operate under the driving of the three-phase alternating current, where the frequency converter 10 is a frequency converter in the above embodiment.
Since the size of the frequency converter 10 in the frequency converter system 30 is reduced, the size of the frequency converter system 30 can be reduced, which contributes to reduction of production cost.
the above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.
Claims (10)
1. A frequency converter, comprising:
The frequency conversion circuit is used for receiving a power supply signal and processing the power supply signal to obtain bus voltage;
And the auxiliary power supply is coupled with the frequency conversion circuit and comprises a first voltage reduction circuit and an isolation circuit which are coupled with each other, the first voltage reduction circuit is used for adjusting the bus voltage to be a first preset voltage, and the isolation circuit is used for adjusting the first preset voltage to be a second preset voltage and isolating the first preset voltage from the second preset voltage.
2. Frequency converter according to claim 1,
The frequency converter further comprises a second voltage reduction circuit, wherein the input end of the second voltage reduction circuit is coupled with the output end of the first voltage reduction circuit and used for adjusting the first preset voltage to be a third preset voltage.
3. Frequency converter according to claim 2,
The number of the second voltage reduction circuits is at least two, and the output end of one second voltage reduction circuit is coupled with the input end of the other second voltage reduction circuit; the first voltage reduction circuit and the second voltage reduction circuit are both voltage reduction type conversion circuits, and the isolation circuit is an isolation direct circuit.
4. frequency converter according to claim 2,
the first voltage reduction circuit, the second voltage reduction circuit and the isolation circuit all comprise magnetic elements, and the magnetic elements are used for filtering or converting input voltage.
5. The frequency converter of claim 2, wherein the power signal is RST three-phase alternating current, and wherein the frequency conversion circuit comprises:
The rectifying circuit is used for rectifying the power supply signal to generate the bus voltage;
and the inverter circuit is coupled with the rectifying circuit and is used for inverting the bus voltage into three-phase alternating current.
6. Frequency converter according to claim 5,
the inverter circuit comprises a rectification circuit, an inverter circuit and a frequency conversion circuit, wherein the rectification circuit is used for rectifying and converting alternating current output by the inverter circuit into alternating current output by the inverter circuit, the frequency conversion circuit further comprises a current limiting circuit, and the current limiting circuit is respectively coupled with the output end of the rectification circuit, the input end of the inverter circuit and the input end of the first voltage reduction circuit and used for controlling the current value input to the inverter circuit within a preset current range.
7. the frequency converter according to claim 6,
The current limiting circuit comprises a switch and a current limiting resistor which are connected in parallel, and the frequency converter further comprises a control circuit which is coupled with the switch and is used for controlling the switch-on and switch-off of the switch; when the switch is switched on, the current-limiting resistor is in short circuit, and the rectifying circuit is coupled with the inverter circuit; when the switch is disconnected, the rectifying circuit is coupled with the inverter circuit through the current-limiting resistor.
8. The frequency converter according to claim 7,
The frequency conversion circuit further comprises a filter circuit, wherein the filter circuit is respectively coupled with the output end of the current limiting circuit and the input end of the inverter circuit, and is used for filtering the signal output by the current limiting circuit and inputting the filtered signal to the inverter circuit.
9. The frequency converter according to claim 8,
The switch is a relay, a contactor or a field effect transistor, the filter circuit comprises a filter capacitor, one end of the filter capacitor is coupled with the output end of the current limiting circuit, and the other end of the filter capacitor is grounded.
10. a frequency converter system, comprising a frequency converter and a motor coupled to each other, wherein the frequency converter is configured to receive a power signal and generate a three-phase alternating current according to the power signal, and the motor is configured to operate under the driving of the three-phase alternating current, and wherein the frequency converter is according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910874308.1A CN110557031A (en) | 2019-09-17 | 2019-09-17 | Frequency converter and frequency converter system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910874308.1A CN110557031A (en) | 2019-09-17 | 2019-09-17 | Frequency converter and frequency converter system |
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| CN110557031A true CN110557031A (en) | 2019-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910874308.1A Pending CN110557031A (en) | 2019-09-17 | 2019-09-17 | Frequency converter and frequency converter system |
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| CN (1) | CN110557031A (en) |
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| CN110597121A (en) * | 2019-09-17 | 2019-12-20 | 苏州安驰控制系统有限公司 | Stranding machine control device |
| CN113381385A (en) * | 2020-03-09 | 2021-09-10 | 士林电机厂股份有限公司 | Method and device with bus current detection and short-circuit protection |
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